Answer: conduction and convection.
- A radiation only
- B conduction and convection
- C convection only
- D radiation and conduction
Correct answer: B. conduction and convection
Explanation: The evacuated gap has almost no matter, so conduction and convection are cut off; silvering handles radiation.
During a phase change (melting or boiling), temperature stays constant while heat is absorbed entirely as latent heat (Q=mL); temperature only rises again once the substance is fully in its new phase.
Concept context
Temperature scales, thermal expansion, calorimetry, and the three modes of heat transfer including radiation laws.